백준 9498(java) : 시험 성적

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String test = sc.nextLine();
		
		int score = Integer.parseInt(test);
		
		if(score >=90 ) {
			System.out.println("A");
		} else if (score >=80) {
			System.out.println("B");
		} else if (score >=70) {
			System.out.println("C");
		} else if (score>=60) {
			System.out.println("D");
		} else {
			System.out.println("F");
		}
	}

}